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The P31 Package for the W204 C63 AMG gives the 6.2 liter AMG V8 motor stronger internals, more horsepower, and a more aggressive tune. The tune is so aggressive some tuners have been accused of simply re-selling it to standard C63 owners. Additionally, getting more power out of P31 cars has proven difficult with scarcely any positive gains posted to this point.

The baseline for the P31 C63 on the dyno graph below from a Dyno Dynamics is 390 and 394 wheel horsepower reflected in the blue and pink lines respectively. Tuned, this rises to 427 and 421 wheel reflected in the green and red lines.

Compare this to a standard C63 AMG which puts down 363.6 wheel horsepower stock, the grey line. Tuned, this rises to 421.3 which is the orange line.

So, the P31 is obviously much stronger in stock form. When tuned, both cars end up around the same spot. This is really the first dyno graph posted on BenzBoost showing solid gains on top of a P31 optioned C63 car.

Very, very nice results by OE Tuning. The graph is below and BenzBoost is attempting to source a higher resolution graph.

This gives me a little insight on how comparable the tunes are...but can't they tune the P31 cars a little harder because of the upgraded internals? Or is it not worth it? I got DD GT3's opinion on tunes, and he did mention the increase in HP but that's about it...I wonder what kind of difference it would make if I get LTH's? I still want an emissions legal set up but definitely more power. I don't want it to be too loud either...I might do electronic cut-outs...I dunno the options are there and I have time...time to study right now, but soon I will be researching tons of stuff and trying to come up with a good combo...anyone have any good combos they are running now?

Sure he p31 internals are a but stronger but you would have to probably push it on race gas to see much if a difference.

p31 tunes are tough there doesn't appear to be all that much to squeeze out. A blower might be nice on those internals...

Haven't had much time to look at the forums lately, so I just saw this...LOL wanna pay for it? I'll let you slap GB stuff all over it I've been saving up as much money as possible for this, but with grad school the saving's been slllllllloooooooow :\